What is the process of shedding of the endometrium called?

The process of shedding of the endometrium is called menstruation. This occurs as part of the menstrual cycle when the uterine lining that thickened in preparation for a potential pregnancy is no longer needed. If fertilization does not occur, hormonal changes trigger the breakdown and expulsion of this tissue, resulting in menstrual bleeding. This process typically happens approximately every 28 days in individuals of reproductive age.